Boundary Atlas

ZIP code 78628: Georgetown, TX

ZIP code 78628 is in Georgetown (54% of residents) and Serenada (5.2%), in Williamson County, Texas. 41% of its residents live outside city limits. It is in Texas's 31st congressional district. Its state senate district is State Senate District 5; its state house districts are State House District 52 (54%) and State House District 20 (46%).

40,378residents (2020 Census)
64.7 sq miland area
4cities and towns
1congressional district
21voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
Georgetown54%
Serenada5.2%
Leander0.2%
Liberty Hill0.1%

CountyShare of ZIP residents
Williamson County100%

Town or county subdivisionShare of ZIP residents
Round Rock-Georgetown CCD100%
Cedar Park-Liberty Hill CCD0.1%

Congressional district

Congressional districtShare of ZIP residents
Texas's 31st congressional district (TX-31)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 5100%

State house districtShare of ZIP residents
State House District 5254%
State House District 2046%

Voting precincts

21 voting precincts overlap ZIP 78628. Map them, with each precinct's share of the ZIP's residents.

Get this in your AI agent

Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:78628")

ZIP 78628 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.